Handheld vaporizer



FIG. 1 is a front view of the handheld vaporizer, showing the new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is top perspective view thereof; and,

FIG. 8 is a bottom perspective view thereof.

The uniformly dashed lines shown in the drawings illustrate portions of the handheld vaporizer which form no part of the claimed design. 

CLAIM The ornamental design for a handheld vaporizer, as shown and described. 